003570000a22001450004500020001500000060000800015082001600023100001600039100002000055245006200075260003800137260000900175300000800184650001900192  a0521324580  a100  a633.491 JEL  aJellis, G J  aRichardson, D E  aProduction of new potato varities: technological advances  aU S A, Cambridge University Press  c1987  a359  aPotato variety